:root {
  --ink: #141414;
  --ink-soft: #30343b;
  --paper: #f4efe6;
  --surface: #fffaf0;
  --accent: #1b3d6e;
  --accent-strong: #0f2a4f;
  --accent-soft: #e6edf6;
  --accent-ink: #fffaf0;
  --heritage: #a02828;
  --heritage-soft: #f2dfd9;
  --open: #2f7d46;
  --muted: #666a72;
  --line: oklch(0.18 0.012 250 / 0.12);
  --line-strong: oklch(0.18 0.012 250 / 0.22);
  --shadow: 0 24px 60px oklch(0.18 0.012 250 / 0.08);

  --font-sans: 'Geist', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Bricolage Grotesque', Georgia, serif;
  --font-mono: 'Geist Mono', ui-monospace, 'SF Mono', Menlo, monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: 'ss01', 'cv11';
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
}

::selection {
  background: var(--accent);
  color: var(--accent-ink);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.section-shell {
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  width: min(1240px, calc(100% - 32px));
  height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: var(--ink);
  min-width: 0;
}

.brand-marks {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}

.brand-mark {
  object-fit: contain;
}

.institute-mark {
  width: 36px;
  height: 42px;
}

.rait-mark {
  width: 58px;
  height: 42px;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.05;
}

.brand small {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-top: 2px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav a {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  padding: 0 12px;
  border-radius: 6px;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: color 160ms cubic-bezier(0.16, 1, 0.3, 1), background 160ms cubic-bezier(0.16, 1, 0.3, 1);
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--ink);
  background: oklch(0.18 0.012 250 / 0.05);
  outline: none;
}

.site-nav .nav-action {
  margin-left: 10px;
  padding: 0 16px;
  background: var(--ink);
  color: var(--paper);
  font-weight: 600;
}

.site-nav .nav-action:hover,
.site-nav .nav-action:focus-visible {
  background: var(--accent);
  color: var(--accent-ink);
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
}

.menu-toggle span:not(.sr-only) {
  width: 18px;
  height: 1.5px;
  background: var(--ink);
}

/* ---------- Hero ---------- */

.hero-section {
  position: relative;
  min-height: 720px;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
}

.hero-bg,
.hero-overlay {
  position: absolute;
  inset: 0;
}

.hero-bg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 35%;
  filter: saturate(0.6) contrast(1.05);
}

.hero-overlay {
  background: linear-gradient(95deg,
    oklch(0.18 0.012 250 / 0.94) 0%,
    oklch(0.18 0.012 250 / 0.76) 48%,
    oklch(0.18 0.012 250 / 0.4) 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
  min-height: 720px;
  padding: 96px 0 80px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  align-items: end;
  gap: 56px;
}

.eyebrow,
.section-kicker,
.meta-label,
.footer-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.hero-section .eyebrow {
  color: oklch(0.99 0.01 255 / 0.78);
}

.hero-copy h1 {
  max-width: 18ch;
  margin: 22px 0 0;
  font-family: var(--font-display);
  font-size: clamp(40px, 6.4vw, 88px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.025em;
  color: var(--paper);
}

.hero-identity {
  margin: 0 0 16px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: oklch(0.99 0.01 255 / 0.86);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero-identity span {
  color: var(--paper);
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: -0.02em;
  text-transform: none;
}

.hero-edition {
  margin: 22px 0 0;
  max-width: 56ch;
  color: oklch(0.99 0.01 255 / 0.72);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
}

.hero-summary {
  margin: 14px 0 0;
  max-width: 60ch;
  color: oklch(0.99 0.01 255 / 0.84);
  font-size: 17px;
  line-height: 1.55;
}

.hero-status {
  margin: 28px 0 0;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px 8px 12px;
  border: 1px solid oklch(0.99 0.01 255 / 0.22);
  border-radius: 999px;
  background: oklch(0.99 0.01 255 / 0.05);
  font-size: 13px;
  flex-wrap: wrap;
}

.hero-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--heritage);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--heritage) 28%, transparent);
  animation: rait-pulse 2.4s cubic-bezier(0.16, 1, 0.3, 1) infinite;
}

.hero-status.is-open .hero-status-dot {
  background: var(--open);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--open) 26%, transparent);
}

.hero-status-label {
  font-weight: 600;
  color: var(--paper);
}

.hero-status-detail {
  color: oklch(0.99 0.01 255 / 0.78);
}

@keyframes rait-pulse {
  0%, 100% { box-shadow: 0 0 0 4px color-mix(in srgb, var(--heritage) 28%, transparent); }
  50% { box-shadow: 0 0 0 8px color-mix(in srgb, var(--heritage) 8%, transparent); }
}

.hero-status.is-open .hero-status-dot {
  animation-name: rait-pulse-open;
}

@keyframes rait-pulse-open {
  0%, 100% { box-shadow: 0 0 0 4px color-mix(in srgb, var(--open) 26%, transparent); }
  50% { box-shadow: 0 0 0 8px color-mix(in srgb, var(--open) 8%, transparent); }
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 30px;
}

.button {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.005em;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 200ms cubic-bezier(0.16, 1, 0.3, 1), background 200ms cubic-bezier(0.16, 1, 0.3, 1);
}

.button.primary {
  background: var(--accent);
  color: var(--accent-ink);
}

.button.primary:hover,
.button.primary:focus-visible {
  background: var(--accent-strong);
  outline: none;
}

.button.secondary {
  color: var(--paper);
  border-color: oklch(0.99 0.01 255 / 0.32);
  background: transparent;
}

.button.secondary:hover,
.button.secondary:focus-visible {
  background: oklch(0.99 0.01 255 / 0.08);
  border-color: oklch(0.99 0.01 255 / 0.5);
  outline: none;
}

.hero-card {
  border: 1px solid oklch(0.99 0.01 255 / 0.16);
  border-radius: 10px;
  background: oklch(0.99 0.01 255 / 0.06);
  backdrop-filter: blur(2px);
  color: var(--paper);
  padding: 22px;
  display: grid;
  gap: 18px;
}

.hero-card .meta-label {
  color: oklch(0.99 0.01 255 / 0.58);
}

.hero-card strong {
  display: block;
  margin-top: 6px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: -0.005em;
  color: var(--paper);
  line-height: 1.25;
}

.hero-card small {
  display: block;
  margin-top: 4px;
  color: oklch(0.99 0.01 255 / 0.66);
  font-size: 13px;
}

.logo-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  align-items: center;
  gap: 18px;
  padding-top: 20px;
  border-top: 1px solid oklch(0.99 0.01 255 / 0.14);
}

.logo-strip img {
  width: 100%;
  max-height: 96px;
  object-fit: contain;
  filter: brightness(0) invert(1) opacity(0.92);
}

/* ---------- Page sections ---------- */

.page-section {
  padding: clamp(72px, 10vh, 120px) 0;
}

.section-heading {
  margin-bottom: 44px;
  max-width: 720px;
}

.section-heading.wide {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 48px;
  align-items: end;
  max-width: none;
}

.section-heading h2 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(32px, 4.4vw, 56px);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.02;
  color: var(--ink);
  max-width: 22ch;
}

.section-heading p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 17px;
  line-height: 1.55;
  max-width: 50ch;
}

/* ---------- About ---------- */

.about-section .two-column {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: 64px;
  align-items: start;
}

.about-section h2 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(28px, 3.6vw, 44px);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--ink);
}

.about-section .body-copy {
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink-soft);
}

.about-section .body-copy p {
  margin: 0 0 14px;
}

.about-section .body-copy strong {
  color: var(--ink);
  font-weight: 600;
}

/* ---------- Sponsors ---------- */

.sponsors-section {
  border-top: 1px solid var(--line);
  padding: clamp(56px, 8vh, 96px) 0;
}

.sponsors-panel {
  display: grid;
  grid-template-columns: minmax(220px, 0.42fr) minmax(0, 1fr);
  align-items: center;
  gap: clamp(24px, 5vw, 64px);
  padding: clamp(24px, 4vw, 36px) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.sponsors-head {
  display: block;
}

.sponsors-head h2 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(28px, 3vw, 38px);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.04;
  color: var(--ink);
  max-width: none;
}

.sponsors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 220px));
  gap: 18px;
  align-items: stretch;
}

.sponsor-card {
  min-height: 152px;
  display: grid;
  justify-items: center;
  align-content: center;
  gap: 14px;
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  text-align: center;
  text-decoration: none;
  box-shadow: none;
  transition: border-color 160ms cubic-bezier(0.16, 1, 0.3, 1), transform 180ms cubic-bezier(0.16, 1, 0.3, 1), box-shadow 180ms cubic-bezier(0.16, 1, 0.3, 1);
}

.sponsor-card:hover,
.sponsor-card:focus-visible {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 14px 32px oklch(0.18 0.012 250 / 0.08);
  outline: none;
}

.sponsor-card img {
  width: min(150px, 45vw);
  height: auto;
  object-fit: contain;
}

.sponsor-name {
  color: var(--ink);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.35;
}

/* ---------- Highlights ---------- */

.highlights-section {
  border-top: 1px solid var(--line);
  padding: clamp(56px, 8vh, 96px) 0;
}

.highlights-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}

.highlights-counter {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.highlights-counter [data-highlights-current] {
  color: var(--heritage);
  font-variant-numeric: tabular-nums;
}

.highlights-counter-sep {
  color: var(--line-strong);
}

.highlights-stage {
  position: relative;
  min-height: 500px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 380px);
  align-items: stretch;
  gap: clamp(28px, 4vw, 56px);
  padding: clamp(28px, 4vw, 44px) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.highlights-detail-deck {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  min-height: 430px;
  height: 100%;
}

.highlights-slide {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(260px, 0.66fr);
  align-items: center;
  gap: clamp(24px, 5vw, 72px);
  opacity: 0;
  transform: translateX(24px);
  transition:
    opacity 600ms cubic-bezier(0.22, 1, 0.36, 1),
    transform 650ms cubic-bezier(0.22, 1, 0.36, 1);
  pointer-events: none;
}

.highlights-slide.is-active {
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
  z-index: 1;
}

.highlights-copy {
  display: grid;
  gap: 18px;
  min-width: 0;
}

.highlights-slide.is-entering-up {
  opacity: 0;
  transform: translateX(32px);
  transition: none;
}

.highlights-slide.is-entering-down {
  opacity: 0;
  transform: translateX(-32px);
  transition: none;
}

.highlights-slide.is-leaving-up {
  opacity: 0;
  transform: translateX(-32px);
}

.highlights-slide.is-leaving-down {
  opacity: 0;
  transform: translateX(32px);
}

.highlights-label {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.highlights-value {
  font-family: var(--font-display);
  font-size: clamp(32px, 5vw, 68px);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1;
  color: var(--ink);
  max-width: 22ch;
}

.highlights-description {
  margin: 0;
  max-width: 52ch;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.55;
}

.highlights-image-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 22px 52px oklch(0.18 0.012 250 / 0.1);
}

.highlights-image-frame::before,
.highlights-image-frame::after {
  content: "";
  position: absolute;
  pointer-events: none;
  z-index: 1;
}

.highlights-image-frame::before {
  inset: 0;
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--surface) 12%, transparent), transparent 34%),
    linear-gradient(135deg, color-mix(in srgb, var(--accent) 14%, transparent), transparent 46%),
    linear-gradient(315deg, color-mix(in srgb, var(--heritage) 10%, transparent), transparent 52%);
  mix-blend-mode: multiply;
}

.highlights-image-frame::after {
  inset: 14px;
  border: 1px solid color-mix(in srgb, var(--surface) 48%, transparent);
}

.highlights-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.82) contrast(1.02);
}

.highlights-image-label {
  position: absolute;
  left: 22px;
  top: 22px;
  z-index: 2;
  padding: 6px 9px;
  border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 1;
  text-transform: uppercase;
}

.highlights-rail {
  display: grid;
  align-content: center;
  gap: 12px;
  perspective: 900px;
}

.highlights-preview {
  width: 100%;
  min-height: 96px;
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  align-items: center;
  gap: 14px;
  padding: 10px 14px 10px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: color-mix(in srgb, var(--surface) 84%, transparent);
  color: var(--ink);
  cursor: pointer;
  text-align: left;
  transform: skewX(-7deg) translateX(0);
  transform-origin: center;
  transition:
    background 180ms cubic-bezier(0.22, 1, 0.36, 1),
    border-color 180ms cubic-bezier(0.22, 1, 0.36, 1),
    box-shadow 180ms cubic-bezier(0.22, 1, 0.36, 1),
    transform 220ms cubic-bezier(0.22, 1, 0.36, 1);
}

.highlights-preview:nth-child(even) {
  transform: skewX(-7deg) translateX(20px);
}

.highlights-preview > * {
  transform: skewX(7deg);
}

.highlights-preview:hover,
.highlights-preview:focus-visible {
  border-color: var(--accent);
  outline: none;
}

.highlights-preview.is-active {
  background: var(--surface);
  border-color: var(--heritage);
  box-shadow: 0 18px 42px oklch(0.18 0.012 250 / 0.1);
  transform: skewX(-7deg) translateX(-10px);
}

.highlights-preview.is-active:nth-child(even) {
  transform: skewX(-7deg) translateX(10px);
}

.preview-thumb {
  position: relative;
  overflow: hidden;
  width: 76px;
  aspect-ratio: 1 / 1;
  border-radius: 4px;
  background: var(--paper);
}

.preview-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.8) contrast(1.02);
}

.preview-copy {
  min-width: 0;
}

.preview-number {
  display: block;
  margin-bottom: 4px;
  color: var(--heritage);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.preview-copy strong {
  display: block;
  color: var(--ink);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.18;
}

.highlights-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left center;
  z-index: 2;
}

.highlights-nav {
  margin-top: 22px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.highlights-control {
  width: 40px;
  height: 40px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: border-color 160ms cubic-bezier(0.22, 1, 0.36, 1), color 160ms cubic-bezier(0.22, 1, 0.36, 1), background 160ms cubic-bezier(0.22, 1, 0.36, 1);
}

.highlights-control svg {
  width: 14px;
  height: 14px;
}

.highlights-control:hover,
.highlights-control:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
  outline: none;
}

@media (prefers-reduced-motion: reduce) {
  .highlights-slide,
  .highlights-preview,
  .highlights-control,
  .highlights-progress {
    transition: none;
  }
  .highlights-slide.is-leaving-up,
  .highlights-slide.is-leaving-down,
  .highlights-slide.is-entering-up,
  .highlights-slide.is-entering-down {
    transform: translateX(0);
  }
}

/* ---------- Tracks ---------- */

.tracks-section {
  border-top: 1px solid var(--line);
}

.track-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: clamp(28px, 4vw, 56px);
  row-gap: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.track-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  padding: clamp(28px, 4vw, 44px) 0;
  align-content: start;
}

.track-row:nth-child(n+3) {
  border-top: 1px solid var(--line);
}

.track-row:nth-child(odd) {
  padding-right: clamp(14px, 2vw, 28px);
}

.track-row:nth-child(even) {
  padding-left: clamp(14px, 2vw, 28px);
  border-left: 1px solid var(--line);
}

.track-num {
  font-family: var(--font-mono);
  font-size: clamp(48px, 5.6vw, 80px);
  font-weight: 400;
  line-height: 0.95;
  letter-spacing: -0.04em;
  color: var(--accent);
}

.track-body h3 {
  margin: 4px 0 16px;
  font-family: var(--font-display);
  font-size: clamp(20px, 2vw, 26px);
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.18;
  color: var(--ink);
  max-width: 22ch;
}

.topic-pills {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.topic-pills li {
  padding: 7px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: 13px;
  color: var(--ink-soft);
  background: var(--surface);
  transition: border-color 160ms cubic-bezier(0.16, 1, 0.3, 1), color 160ms cubic-bezier(0.16, 1, 0.3, 1);
}

.topic-pills li:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ---------- Dates / Timeline ---------- */

.dates-section {
  border-top: 1px solid var(--line);
}

.timeline {
  list-style: none;
  margin: 0;
  padding: 12px 0 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  column-gap: clamp(20px, 3vw, 40px);
  row-gap: 0;
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 19px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--line-strong);
  z-index: 0;
}

.timeline-item {
  position: relative;
  padding-top: 32px;
  display: grid;
  gap: 6px;
  align-content: start;
  min-width: 0;
}

.timeline-rule {
  display: none;
}

.timeline-marker {
  position: absolute;
  top: 0;
  left: 0;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--line-strong);
  z-index: 1;
}

.timeline-item.is-done .timeline-marker {
  background: var(--ink-soft);
  border-color: var(--ink-soft);
}

.timeline-item.is-active .timeline-marker {
  background: var(--heritage);
  border-color: var(--heritage);
  box-shadow: 0 0 0 4px var(--heritage-soft);
}

.timeline-label {
  margin-top: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  word-break: break-word;
}

.timeline-date,
.timeline-detail {
  word-break: break-word;
}

.timeline-item.is-active .timeline-label {
  color: var(--heritage);
}

.timeline-date {
  font-family: var(--font-display);
  font-size: clamp(20px, 2vw, 26px);
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.15;
  color: var(--ink);
}

.timeline-item.is-done .timeline-date,
.timeline-item.is-done .timeline-detail {
  color: var(--muted);
}

.timeline-detail {
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.45;
}

.timeline-chip {
  margin-top: 10px;
  align-self: start;
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--heritage);
  color: var(--accent-ink);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  width: max-content;
}

/* ---------- Committee ---------- */

.committee-section {
  border-top: 1px solid var(--line);
}

.committee-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: clamp(32px, 5vw, 72px);
  row-gap: 36px;
}

.committee-group {
  display: grid;
  gap: 18px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.committee-group:nth-child(-n+2) {
  border-top: 0;
  padding-top: 0;
}

.committee-group-head h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 2vw, 24px);
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.2;
  color: var(--ink);
  max-width: 22ch;
}

.committee-group-head p {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.member-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.committee-member {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  align-items: center;
  gap: 14px;
}

.committee-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--accent-soft);
}

.committee-avatar.initials {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.committee-member-text strong,
.committee-member-text span {
  display: block;
}

.committee-member-text strong {
  color: var(--ink);
  font-size: 16px;
  font-weight: 500;
  line-height: 1.3;
}

.committee-member-text span {
  margin-top: 2px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

/* ---------- Venue ---------- */

.venue-section {
  border-top: 1px solid var(--line);
}

.venue-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: 56px;
  align-items: center;
}

.venue-layout h2 {
  margin: 14px 0 14px;
  font-family: var(--font-display);
  font-size: clamp(28px, 3.6vw, 44px);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--ink);
}

.venue-layout p {
  margin: 6px 0 0;
  color: var(--ink-soft);
  font-size: 17px;
  line-height: 1.5;
}

.venue-layout img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: 12px;
}

/* ---------- Contact (drenched) ---------- */

.contact-section {
  background: var(--accent);
  color: var(--accent-ink);
  border-top: 0;
}

.contact-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(32px, 5vw, 80px);
  align-items: end;
}

.contact-card .section-kicker {
  color: oklch(0.99 0.01 255 / 0.7);
}

.contact-card h2 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(40px, 5.2vw, 72px);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1;
  color: var(--accent-ink);
  max-width: 14ch;
}

.contact-card p {
  margin: 18px 0 0;
  color: oklch(0.99 0.01 255 / 0.84);
  font-size: 17px;
  line-height: 1.55;
}

.contact-links {
  display: grid;
  gap: 10px;
}

.contact-links a,
.contact-links span {
  display: flex;
  align-items: center;
  padding: 18px 22px;
  border: 1px solid oklch(0.99 0.01 255 / 0.28);
  border-radius: 10px;
  color: var(--accent-ink);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: border-color 200ms cubic-bezier(0.16, 1, 0.3, 1), background 200ms cubic-bezier(0.16, 1, 0.3, 1);
}

.contact-links a:hover,
.contact-links a:focus-visible {
  border-color: var(--accent-ink);
  background: oklch(0.99 0.01 255 / 0.08);
  outline: none;
}

/* ---------- Footer ---------- */

.site-footer {
  padding: 40px 0 32px;
  background: var(--ink);
  color: oklch(0.99 0.01 255 / 0.72);
  font-size: 14px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 32px;
  align-items: start;
}

.footer-grid strong {
  display: block;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.footer-grid p {
  margin: 8px 0 0;
  color: oklch(0.99 0.01 255 / 0.6);
  line-height: 1.5;
}

.footer-grid a {
  display: block;
  color: var(--paper);
  text-decoration: none;
  margin-top: 4px;
}

.footer-grid a:hover,
.footer-grid a:focus-visible {
  color: var(--accent-soft);
  outline: none;
}

.footer-label {
  display: block;
  margin-bottom: 10px;
  color: oklch(0.99 0.01 255 / 0.6);
}

.footer-acknowledgment {
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid oklch(0.99 0.01 255 / 0.14);
}

.footer-acknowledgment h2 {
  margin: 0;
  color: var(--paper);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0;
}

.footer-acknowledgment p {
  max-width: 980px;
  margin: 8px 0 0;
  color: oklch(0.99 0.01 255 / 0.66);
  line-height: 1.55;
}

/* ---------- Admin ---------- */

body.admin-page {
  min-height: 100vh;
  background: var(--paper);
}

.admin-shell {
  width: min(780px, calc(100% - 32px));
  margin: 0 auto;
  padding: 64px 0;
}

.admin-panel {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 36px;
}

.admin-panel h1 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.admin-panel p {
  color: var(--ink-soft);
}

.admin-section {
  margin-top: 30px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.admin-section h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.admin-section p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.55;
}

.admin-form {
  display: grid;
  gap: 18px;
  margin-top: 28px;
}

.admin-form label {
  display: grid;
  gap: 8px;
  color: var(--ink);
  font-weight: 500;
  font-size: 14px;
}

.admin-form input,
.admin-form select {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  padding: 10px 14px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
}

.admin-form input:focus,
.admin-form select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.toggle-field {
  position: relative;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 14px;
  align-items: center;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--paper);
  cursor: pointer;
}

.toggle-field input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.toggle-switch {
  position: relative;
  width: 50px;
  height: 28px;
  border-radius: 999px;
  background: var(--line-strong);
  transition: background 160ms cubic-bezier(0.16, 1, 0.3, 1);
}

.toggle-switch::after {
  content: "";
  position: absolute;
  top: 4px;
  left: 4px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--surface);
  box-shadow: 0 2px 6px oklch(0.18 0.012 250 / 0.18);
  transition: transform 180ms cubic-bezier(0.16, 1, 0.3, 1);
}

.toggle-field input:checked + .toggle-switch {
  background: var(--accent);
}

.toggle-field input:checked + .toggle-switch::after {
  transform: translateX(22px);
}

.toggle-field input:focus-visible + .toggle-switch {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.toggle-field strong,
.toggle-field small {
  display: block;
}

.toggle-field strong {
  color: var(--ink);
  font-size: 15px;
  line-height: 1.25;
}

.toggle-field small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 400;
  line-height: 1.4;
}

.admin-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.admin-button {
  min-height: 46px;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 0 20px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

.admin-button:hover {
  background: var(--accent-strong);
}

.admin-button.secondary {
  background: var(--ink);
  color: var(--paper);
}

.admin-button.secondary:hover {
  background: var(--ink-soft);
}

.notice {
  border-radius: 8px;
  padding: 14px 16px;
  margin: 20px 0 0;
  font-size: 14px;
  font-weight: 500;
}

.notice.success {
  background: oklch(0.96 0.04 145);
  color: oklch(0.32 0.12 145);
}

.notice.error {
  background: oklch(0.96 0.04 28);
  color: oklch(0.4 0.16 28);
}

.preview-name {
  color: var(--muted);
  font-size: 13px;
  font-family: var(--font-mono);
}

/* ---------- Responsive ---------- */

@media (max-width: 960px) {
  .menu-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--surface);
    box-shadow: var(--shadow);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    justify-content: center;
  }

  .site-nav .nav-action {
    margin-left: 0;
    margin-top: 6px;
  }

  .hero-content,
  .about-section .two-column,
  .section-heading.wide,
  .venue-layout,
  .contact-card,
  .committee-list,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .committee-group:nth-child(-n+2) {
    border-top: 1px solid var(--line);
    padding-top: 24px;
  }

  .committee-group:first-child {
    border-top: 0;
    padding-top: 0;
  }

  .hero-content {
    min-height: auto;
    padding-top: 72px;
    gap: 32px;
  }

  .timeline {
    grid-template-columns: 1fr;
    gap: 0;
    padding-top: 0;
  }

  .timeline-item {
    padding: 24px 0 24px 36px;
    border-left: 1px solid var(--line-strong);
    margin-left: 7px;
  }

  .timeline-item.is-active {
    border-left-color: var(--heritage);
  }

  .timeline-rule {
    display: none;
  }

  .timeline-marker {
    top: 28px;
    left: -8px;
  }

  .track-list {
    grid-template-columns: 1fr;
  }

  .track-row {
    gap: 12px;
    padding: 28px 0;
  }

  .track-row:nth-child(odd),
  .track-row:nth-child(even) {
    padding-left: 0;
    padding-right: 0;
    border-left: 0;
  }

  .track-row:nth-child(n+2) {
    border-top: 1px solid var(--line);
  }

  .track-num {
    font-size: clamp(48px, 12vw, 72px);
  }

  .committee-group {
    gap: 18px;
  }

  .highlights-stage {
    height: auto;
    min-height: 0;
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .highlights-detail-deck {
    min-height: 620px;
  }

  .highlights-slide {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .highlights-value {
    font-size: clamp(28px, 7vw, 48px);
  }

  .highlights-image-frame {
    width: min(100%, 420px);
    justify-self: start;
  }

  .highlights-rail {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-content: start;
    gap: 10px;
  }

  .highlights-preview,
  .highlights-preview:nth-child(even),
  .highlights-preview.is-active,
  .highlights-preview.is-active:nth-child(even) {
    min-height: 164px;
    grid-template-columns: 1fr;
    align-content: start;
    gap: 9px;
    padding: 10px;
    transform: skewX(-5deg);
  }

  .highlights-preview > * {
    transform: skewX(5deg);
  }

  .preview-thumb {
    width: 100%;
    aspect-ratio: 4 / 3;
  }

  .preview-copy strong {
    font-size: 12px;
  }
}

@media (max-width: 640px) {
  .section-shell {
    width: min(100% - 28px, 1180px);
  }

  .header-inner {
    width: min(100% - 24px, 1240px);
    height: 64px;
  }

  .site-nav {
    top: 64px;
  }

  .brand small {
    display: none;
  }

  .brand {
    gap: 10px;
  }

  .brand-marks {
    gap: 6px;
  }

  .institute-mark {
    width: 30px;
    height: 36px;
  }

  .rait-mark {
    width: 48px;
    height: 36px;
  }

  .hero-section {
    min-height: 0;
  }

  .hero-content {
    padding: 44px 0 48px;
  }

  .hero-identity {
    margin-bottom: 12px;
    font-size: 11px;
    letter-spacing: 0.09em;
  }

  .hero-identity span {
    font-size: 18px;
  }

  .hero-copy h1 {
    margin-top: 16px;
    font-size: clamp(36px, 10vw, 42px);
    letter-spacing: -0.02em;
  }

  .hero-edition {
    margin-top: 18px;
    font-size: 12px;
    line-height: 1.55;
  }

  .hero-summary {
    font-size: 15.5px;
    line-height: 1.48;
  }

  .hero-status {
    flex-direction: row;
    align-items: center;
    width: 100%;
    margin-top: 22px;
  }

  .hero-status-detail {
    flex-basis: 100%;
    margin-left: 18px;
  }

  .sponsors-panel {
    padding: 28px 0;
    grid-template-columns: 1fr;
  }

  .sponsors-grid {
    grid-template-columns: 1fr;
  }

  .page-section {
    padding: 56px 0;
  }

  .highlights-stage {
    height: auto;
    gap: 24px;
  }

  .highlights-detail-deck {
    min-height: 620px;
  }

  .highlights-slide {
    padding: 20px 0;
  }

  .highlights-image-frame {
    width: 100%;
  }

  .highlights-image-frame {
    aspect-ratio: 4 / 3;
  }

  .highlights-rail {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .highlights-preview,
  .highlights-preview:nth-child(even),
  .highlights-preview.is-active,
  .highlights-preview.is-active:nth-child(even) {
    min-height: 140px;
    transform: skewX(-3deg);
  }

  .highlights-preview > * {
    transform: skewX(3deg);
  }

  .preview-number {
    font-size: 9px;
  }

  .preview-copy strong {
    font-size: 11px;
  }

  .hero-card {
    display: none;
  }

  .hero-actions,
  .admin-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .button,
  .admin-button {
    width: 100%;
  }

  .logo-strip {
    grid-template-columns: 56px 96px 1fr;
  }

  .contact-card {
    padding: 32px 0;
  }
}